Dressing roll

ABSTRACT

A dressing roll formed of a ring-shaped rim diametrically cut into two axially and radially aligned semicircular halves, with a continuous abrasive-coated dressing groove formed in the peripheral edge of said rim. Each rim half is provided with a ring-shaped end plate integral with its inner surface at one end thereof, with the plates being less than one-half the axial thickness of the rim. The plates are arranged face to face, encircled by and arranged within the rim, and are fastened together by adjustable mechanical fasteners for axially shifting and then fixing the two rim halves relative to each other for thereby axially offsetting the two halves of the groove formed in the rim halves.

United States Patent [72] inventor FrankP. Tuczak Livonia, Mich.

211 Appl. No. 71,521

[22] Filed Sept. 11, 1970 (45] Patented Dec. 7, 1971 [73] Assignee Sldley Diamond Tool Co.

Detroit, Mich.

[541 DRESSING ROLL 4 Claims, 10 Drawing Figs.

[52] U.S. C1. 51/2065, 5l/207,51/295, 125/11 CD [51] lnt.Cl B24d 17/00 Field 01 Search 51/204, 206, 206.4, 206.5, 207, 80 B, 295, 309; 125/11 R,

l 1 CD, 39'

[56] References Cited UNITED STATES PATENTS 2,975,782 3/1961 Balsiger 125/1 1 CD 3,157,174 11/1964 Emery 125/39X 3,347,219 10/1967 Wellborn 51/207 X FORElGN PATENTS 842,170 7/1960 Great Britain 51/2065 Primary Examiner-Donald G. Kelly Attorney-Cullen, Settle, Sloman & Cantor ABSTRACT: A dressing roll formed of a ring-shaped rim diametrically cut into two axially and radially aligned semicircular halves, with a continuous abrasive-coated dressing groove formed in the peripheral edge of said rim. EllLh rim half is provided with a ring-shaped end plate integral with its inner surface at one end thereof, with the plates being less than one-half the axial thickness of the rim. The plates are arranged face to face, encircled by and arranged within the rim, and are fastened together by adjustable mechanical fasteners for axially shifting and then fixing the two rim halves relative to each other for thereby axially offsetting the two halves of the groove formed in the rim halves.

PATENTED Me 7:97: 3525435 saw 1 or 2 FIG-2 INVENTOR FRANK F. TUVCZAK Y a a /M fnawi z ATTORNEYS PATENTEDBEC 7lfl7l 3,626,435

SHEET 2 [1F 2 /3 INVENTOR Z4 FRANK F2 TUCZAK ATTORNEYS DRESSING ROLL BACKGROUND OF INVENTION The invention herein relates to an improved dressing roll which is used for finally grinding or abrading the opposite faces of gear teeth and the like type of articles.

, In the past, dressing rolls have been formed in the shape of a cylinder for mounting upon a drive shaft for rotating the cylinder, with a peripheral, continuous groove of a shape and size to receive the article to be dressed, such as the teeth of a gear. The groove was coated with a thin coating of an abrasive material and by being accurately dimensioned produced an accurate final dressing or grinding of the gear tooth or the like. However, the high degree of accuracy usually required for this sort of device, makes it difficult and expensive to form the groove properly.

Hence, another form of dressing roll used in the past, consisted of what amounted to two circular disks secured together face to face, each having a peripheral edge out into the shape of one-half of the dressing groove so that when the disks were fastened together, the complete groove was formed. By adjustably fastening the disks together, accuracy of the groove could be set.

In the foregoing devices where the groove completely encircles the roll for 360, it is difficulty and expensive and in many cases it is not possible, for all practical purposes, to accurately grind or dress a sharp or V-shaped tooth particularly at the vertex thereof because of the difficulty of forming a sharp V- shaped groove accurately enough.

Thus, the invention herein relates to improvements to such types of dressing rolls which substantially eliminates the foregoing problems.

SUMMARY OF INVENTION The dressing roll herein is formed of two roll halves in the form of axially and radially aligned rims, each having an integral central ring portion so that the rims together form a complete cylinder with the rings contained within and with mechanical fasteners adjustably securing the rings together face to face for axial adjustment thereof. Thus, each rim portion contains half of the dressing groove wherein the two halves may be slightly ofi'set axially. By offsetting the two groove halves, each of which forms 180 of the complete 360 groove, one side face of one half abrades one-half of the gear tooth for 1 80 of revolution and thereafter the opposite face of the opposite groove half abrades the opposite tooth face for the next 180 of revolution. Thus, the opposite faces of the tooth are successively abraded each 180 and each by an opposite face of the groove.

The two opposite groove faces can thus be axially adjusted, meaning brought closer or further apart, and can be arranged in overlapping planes to form sharp V-configurations for a complete 360 rotation.

With this construction, the roll may be formed of a solid cylinder having one or more peripheral grooves cut therein and thereafter the roll may be split by cutting into the two substantially identical but opposite roll parts which are thereafter fastened together by mechanical fasteners for use. Thus, the groove need not be accurately dimensioned, since accurate dimensioning is obtained during the fastening of the two parts together and the roll tool may be repeatedly used for different width teeth or the like, including for sharp edges teeth.

These and other objects and advantages of this invention will become apparent upon reading the following description, of which the attached drawings form a part.

DESCRIPTION OF DRAWINGS FIG. I is a side elevational view of the dressing roll herein.

FIG. 2 is a side, elevational, cross-sectional view of the dressing roll of FIG. 1.

FIG. 3 is an end view, to a smaller scale, taken in the direction of arrows 3-3 of FIG. 2, and

FIG. 4 is an opposite end view, to a smaller scale, taken in the direction of arrows 4--4 of FIG. 2.

was

FIG. 5 is a perspective view of the roll.

FIGS. 6 and 7 are each perspective views of the two halves forming the roll.

FIG. 8 is an enlarged, schematic view, showing the offsetting of the two roll halves.

FIG. 9 is a schematic, enlarged view showing the arrangement of the roll halves for grinding a tooth.

FIG. 10 is a view similar to FIG. 9, but showing a different offset position of the roll halves.

DETAILED DESCRIPTION Dressing roll 10 is formed in cylindrical shape with one or more abrasive-coated dressing grooves 11 formed in its peripheral edge. The roll is formed of two substantially identical but mirror image halves l2 and 13, each comprising a semicircular rim portion 14 and a circular plate portion 15 integral therewith. The plate portions are each preferably less than one-half the thickness of the rim portions.

The two halves l2 and 13 are arranged as shown in FIGS. 6 and 7 and thereafter interfitted as shown in FIG. 2 with the plate portions arranged face to face and encircled by the completed rim formed by the axially and radially aligned rim halves, each of which contains one-half of the groove 11.

A spacer sheet or disk 16 of a predetermined thickness is arranged between the two plate portions, in face to face contact therewith, and the plate portions are fastened together by suitable mechanical fasteners, such as machine screws or bolts 17 arranged in aligned threaded holes 18.

Aligned central openings 20 are formed in the plate portions, along with aligned key slots 21 so that the roll may be mounted upon a drive shaft and secured thereto with the conventional key-type connector.

OPERATION Referring to FIGS. 8-10, the roll halves are axially adjusted relative to each other to slightly offset one groove half 22 from the other groove half 23. This may be done by using different thicknesses of spacers 16 or other suitable and equivalent types of mechanical fasteners. FIG. 8 schematically shows the groove halves 22 and 23 offset as represented by dotted lines a-b. It also shows the abrasive coating 24 on the walls and base of the groove halves, this abrasive coating being formed of conventional materials such as diamond or carbide particles or the like. 7

For grinding a gear tooth 25 on a gear 26, one face 27 of the tooth is dressed or ground by one face of groove half 22, whereas the opposite tooth face-28 is dressed by the opposite groove face of the groove half 23. Thus, as the roll is rotated for of the rotation, one face of the tooth is dressed and for the other 180 the opposite face of the tooth is dressed.

As can be seen by the solid and dotted lines in FIG. 9, representing the two groove halves, axial adjustment of the roll halves permits accurately setting and holding the required dimension of the tooth.

As shown in F I0. 10, by moving the two plates close enough together, the opposite faces of the two groove halves can be made to cross or overlap in their circular travel so as to dress even a sharp-edged tooth.

Where desired, a number of grooves can be cut into the roll for simultaneously dressing a number of teeth or similarly shaped articles, the structure and operation being otherwise essentially the same.

METHOD OF FORMING ROLL Preferably, the roll is formed by first starting with the cylinder 10 properly cut and machined to the exterior dimensions with the central opening 20. Thereafter, the groove or grooves 11 are formed in the periphery. Next, by suitable machining operation, the interior cuts are made to form the rim and plate portions, thereby separating the monolithic cylinder into the two halves.

Following that operation, the two halves are reassembled with the spacer and screws as indicated. In following this method the dressing groove 11 is accurately formed and aligned with both of the roll halves.

Having fully described an operative embodiment of this invention, I now claim:

1. A dressing roll comprising a ring-shaped rim having a continuous. abrasive-coated dressing groove formed in the peripheral edge thereof;

said rim being diametrically split into two axially and radially aligned rim halves so that each includes a 180 portion of the groove; each rim half having a circular end plate formed integral with its inner surface along one end thereof with the plates being narrower than the axial length of the rim;

said plates being arranged face to face with their peripheral edges completely encircled by the rim; adjustable fastening means interconnecting the two plates for axially adjustably moving the plates towards and away from each other and for fixing the plates relative to each other for thereby axially shifting and fixing the two rim halves with their groove portions, relative to each other;

whereby as the roll is rotated during 180 of its rotation, one groove forming wall of the groove portion of one rim half abrades one face of an article to be dressed, and during the other l80 of rotation the opposite groove forming wall of the groove portion of the opposite rim half abrades the opposite face of said article.

2. A dressing roll as defined in claim 1, and including a spacer of predetermined thickness arranged between the two plates in face to face contact therewith, for thereby axially locating the two plates and their integral rims relative to each other and thus along with said mechanical fasteners, fixing the rim groove portions relative to each other.

3. A dressing roll as defined in claim 1, and including a central opening formed in each plate, the openings being axially aligned for mounting the roll upon a drive shaft.

4. A method for forming a dressing roll comprising forming a cylindrically shaped roll and cutting at least one continuous dressing groove around the entire periphery thereof;

then cutting the cylinder into two halves, each half being cut into a semicircular rim portion with an integral circularshaped plate portion, with each plate portion being thinner than the axial length of its rim portion and being formed at one end of its plate portion;

then interfitting the two halves by axially and radially aligning the rim halves and arranging both plates face to face and encircled by the aligned rim halves;

thereafter mechanically fastening the plates together with adjustable fasteners formed for axially shifting and fixing the plates relative to each other for thereby axially shifting and fixing the rim halves and their peripheral groove portions. 

1. A dressing roll comprising a ring-shaped rim having a continuous, abrasive-coated dressing groove formed in the peripheral edge thereof; said rim being diametrically split into two axially and radially aligned rim halves so that each includes a 180* portion of the groove; each rim half having a circular end plate formed integral with its inner surface along one end thereof with the plates being narrower than the axial length of the rim; said plates being arranged face to face with their peripheral edges completely encircled by the rim; adjustable fastening means interconnecting the two plates for axially adjustably moving the plates towards and away from each other and for fixing the plates relative to each other for thereby axially shifting and fixing the two rim halves with their groove portions, relative to each other; whereby as the roll is rotated during 180* of its rotation, one groove forming wall of the groove portion of one rim half abrades one face of an article to be dressed, and during the other 180* of rotation the opposite groove forming wall of the groove portion of the opposite rim half abrades the opposite face of said article.
 2. A dressing roll as defined in claim 1, and including a spacer of predetermined thickness arranged between the two plates in face to face contact therewith, for thereby axially locating the two plates and their integral rims relative to each other and thus along with said mechanical fasteners, fixing the rim groove portions relative to each other.
 3. A dressing roll as defined in claim 1, and including a central opening formed in each plate, the openings being axially aligned for mounting the roll upon a drive shaft.
 4. A method for forming a dressing roll comprising forming a cylindrically shaped roll and cutting at least one continuous dressing groove around the entire periphery thereof; then cutting the cylinder into two halves, each half being cut into a semicircular rim portion with an integral circular-shaped plate portion, with each plate portion being thinner than the axial length of its rim portion and being formed at one end of its plate portion; then interfitting the two halves by axially and radially aligning the rim halves and arranging both plates face to face and encircled by the aligned rim halves; thereafter mechanically fastening the plates together with adjustable fasteners formed for axially shifting and fixing the plates relative to each other for thereby axially shifting and fixing the rim halves and their peripheral groove portions. 